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From a purely biomechanical point of view, the design of the human penis has its pros and cons. Thanks to clever hydraulics and some very stretchy material, the organ is capable of eyebrow-raising changes in size and shape. But indestructible it is not. "It's too bad men aren't issued an owner's manual for their penis. They don't realize it's possible to injure it during sex," says Dr. Drogo Montague, director of the center for genitourinary reconstruction at the Cleveland Clinic in Ohio.